762 Okdeb 155.— CTPBRACE^ 



/?. mcEOSPBBMA Dew. Spihelets closely aggregated, whole spike leas com- 

 pact ; perig. more convex, shorter, leas acuminated into a beak, very abun- 

 dant. — Grows with the other, in dry and moist situations. (0. microsperma 

 Wahl.) 



23 C. set^oea Dew. SpikeUis ovate, alternate, obtuse, conglomerate, braoteate ; 

 perig. ovate-lanceolate, acuminate, compressed, bifid, some diverging, about equal 

 to the ovate-lanceolate, awned glume ; st. 2f high, acutely triangular, scabrous 

 above and striate. — Wet places, not abundant. 



24 C. teretiuscula Good. Spikelets ovate, acute, sessile, decompound, brown- 

 ish, lower one bracteate ; perig. ovate, acute, convex and gibbous, scabrous ou 

 the edge, spreading, longer than the ovate, acute glume ; fr. brown ; st. 18 to 36' 

 high, leafy towards the root. — Wet places, common, in tufts. 



25 C. stipata Muhl. SpiJce often decompound; spikelsts oUong, aggregated, 

 numerous, bracteate; perig. ovate-lanceolate, round at the base, plano-convex, 

 nerved, bifid, subsoabrous on the margin, diverging, twice longer than the ovate- 

 lanceolate glume ; st. thick, acutely triquetrous, concave ou the sides. — Wet places 

 and marshes, abundant. 



26 C. Cni3-Corvi Shuttl. (Boott. lUus. No. 6-t.) Spike decompound, subpani- 

 culaie, commonly largo, and branching below ; spikelets ovate, numerous, aggre- 

 gated, sessile; perig. short-ovate, very long-rostrate, veined, convex-concave, 

 often horizontal, thrice longer than the ovate, acute glume; culm leafy; Iva. 

 rough-edged; plant light green. — River swamps, Wis. to Ohio and Fla." (C. 

 Halei Dew. G. sieasformis Boott.) 



27 C. VTilpina L. SpUce long, la/rge, decoinponnd, forming densely aggregated 

 heads, often with single but close and oval spikelets, and often less compacted ; 

 perig. ovate, broad, tapering into a 2-toothed beak, often diverging in ripening, a 

 litlle longer and narrower than the ovate, acute glume ; culm large, strong and 

 rough. — Ohio (Sullivant) to Nebraska (Hayden). 



28 C. alopecoidea Tuckerman. (B. t. p. 67.) Spike compound, rather loose, 

 spikelets 8 to 10, aggregated into an oblong head, braoteate, sessile ; perig. ovate, 

 plano-convex, scarcely nerved, acuminate, serrulate on tlio edge, bifid, subroa- 

 trate, a little longer than the ovate and acuminate glume ; st. triquetrous, scab- 

 rous on the edges. — Moist woods, Penn. and N. T. (Sartwell). 



29 C. stellul^ta Good. Spikelets 4 — 6, ovate, remotish, sessile ; perig. broad- 

 ■ovate, contracted into a short beak, compressed, slightly bifid, scabrous on the edge, 

 diverging and reflexed, a little longer than the ovate, obtusish glume ; st. erect, 

 stiff, leafy below, 8 — 24' high. — Common in wet places over the Northern 

 States. 



30 C. scirpoides Schk. Spikelets about 4, ovate, approximate, sessile, obtuse, 

 lowest braoteate ; perig. ovate, cordate, compressed, lanceolate or rostrate, scabrous 

 on the margin, diverging or horizontal, longer than the ovate-lanceolate, acute 

 glume; st. 6 — 16' high, leafy towards the base. — ^Wet places in the country. 

 The more lanceolate fruit and glume, and more flexible stem, separate it from the 

 preceding. C. scirpoides has tho stamens chiefly below the upper spikelet. (C. 

 stellulata /?. Torr. &c.) 



3X C. Biiokleyi Dow. Spike compounded of about 5 ovate, alternate, approxi- 

 mate spikelets ; perig. ovate-lanceolate, 2-lobed at tlie orifice, concave or flattish be- 

 low, smooth, about twice longer than the ovate-acute glume; culm about If 

 high, slender, with lance-linear Ivs. towards tho base ; stam. chiefly at the baa9 

 of the upper spikeleta — Mts. of Car. and Ga. (Buckley.) (C. Gibhardi, Buckl. 

 nee. Schk.) 



32 C. curta Good. Spikelets 4 — 7, ovate-oblong, upper subapproximate, lower 

 often remote ; perig. round-ovate, obtusish, diverging, convexo-concave, 2-to<jthed, 

 slightly scabrous, longer than the ovate, white, hyaline glume ; st. 1 — 2f high, usu- 

 ally light green, with silvery or hoary spikelets. — Moist places over the country. 

 (G. Richardi Mx.) 



33 C, ten^lla Ehrh. nee Schk. Spikelets 3 or 4, ovate, roundish, remote, sessile, 

 few (2 to 6)-fruited; perig. lance-ovate or roundish, rostrate, longer than the ovate, 

 hyaline, white glume ; culm 1 to 2f higli, slender, flaccid, and with the Ivs. green. 



